(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The manufacture and properties of iron and steel"

AUSTRIA-HUNGARY.
581
The province of Silesia produced three times as much coal as Moravia, but the latter division made the most coke, as the southern portion seems to give the best material for smelting. ' The predominant iron and steel producer in this region is the works at Witkowitz in the province of Moravia. This plant draws much of its ore from its own mines in Hungary, the deposit being a carbonate, which is roasted. It makes about one-quarter of all the pig-iron that is made in Austria, the output being about 25,000 tons per month. There are six blast furnaces and two acid-lined converters and eight twenty-ton basic open-hearth furnaces, which are operated by the duplex process, the pig being first blown in an acid converter, and then transferred to a basic open-hearth furnace. The pig is of the following composition: Si, 1.2; Mn, 2.7; P, 0.2; C. 3.7. It is evident that the charge could not be finished in a basic converter, owing to the- low content of phosphorus, but after the oxidation of the silicon and most of the carbon the time in the open-hearth furnace is reduced to about three hours. Under this practice only a small proportion of ore is needed in the open-hearth furnace, a matter of considerable importance at Witkowitz, as good lump ore must be "brought from Sweden. It may also be considered that the blast furnace is not confined to narrow lynits of silicon, as in basic practice. The slags from the acid converter and the basic hearth run as follows:
Slags from Duplex Process at Witkowitz.
	Converter.	Open Hearth.
Fe ........................	6.75	18.03
Mn .....................	26.27	7.33
SiO, ......................	50.84	15.10
AloOs.        ; ........ ....	6.06	2.89
CaO ....................	1.49	37.10
MgO ......................	0.23	7.50
p2o6.. ...I...........	0.04	4.05
		
The works produces large quantities of all forms of rolled steel and has a large steel-casting plant. In the coal region of Silesia are the works at Trynietz, with two acid converters and seven basic open-hearth furnaces, and mills for rails, structural shapes and merchant iron. Table XXVII-E gives the principal works in Moravia and Silesia.
T